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Income taxes - Summary of Valuation Allowance for Deferred Tax Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Deferred Tax Assets, Valuation Allowance [Roll Forward]
Beginning balance	$ 97,396	$ 28,959	$ 107,583	$ 27,470
Charged to income tax recovery	676	(1,582)	(791)	(1,731)
Charged (reduction) to OCI	(6,418)	2,664	(15,138)	4,302
Reductions to other accounts	0	(211)	0	(211)
Ending balance	$ 91,654	$ 29,830	$ 91,654	$ 29,830

X

- Definition

Deferred Tax Assets, Valuation Allowance

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Valuation Allowance Deferred Tax Asset, Charged To Income Tax Expense (Recovery)

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Valuation Allowance Deferred Tax Asset, Reduction To Other Comphrensive Income OCI

+ References

No definition available.

+ Details

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Namespace Prefix:	aqunf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Valuation Allowance Deferred Tax Asset, Reductions To Other Assets

+ References

No definition available.

+ Details

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Namespace Prefix:	aqunf_
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X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-2

+ Details

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Balance Type:	credit
Period Type:	instant